Home' RTCA Documents for Review : DO-230H FRAC Contents 122
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When the Credential is intended to be used as both an ID Photo Badge as well as a Credential used for
access in a local PACS, the Airport Operator must determine where and how to procure the card stock that
will be used in the airport Credentialing system. In addition, the issuing airport operator must determine the
data format (also referred as Data Model) of the PACS where the credential is to be registered and
Solution for interoperable, non-proprietary credential
Use of a non-proprietary identifier that is scalable to accommodate a global population and could be created
by any issuer was at the top of the priorities in the U.S. Department of Defense (DoD) community. U.S.
and allies such as Great Britain and Canada, to name a few, needed a credential that could (i) be issued by
either party participating in defense programs, (ii) could be trusted by all agreeing entities and (iii) could
be created without a central registry. While id credential issuing policy conformance is out of scope for
this paper, technical conformance of a unique identity card through the use of a Universally Unique
Identifier, or UUID, is briefly described below.
Universal User Identifier, and Globally Unique Identifiers GUID, are terms that are also used and
PACS Considerations for Credential interoperability.
As described above, legacy PACS have for decades used a proprietary card data model that limits
interoperability. Card technology, such as magnetic stripe, 125 KHz proximity and many biometric readers,
have been adapted to a basic data model referred to as 26-Bit Wiegand. With some variations, this data
model is widely deployed globally.
Today, a few of the leading PACS Manufacturers are offering PACS that feature two significant benefits;
Capability of processing a larger identifier;
Not dependent on a proprietary data formats
These are important development achievements. As a result, the legacy data model is becoming obsolete.
No longer is the central registry of issued credentials required to minimize duplication. In addition
cryptographic authentication methods may be added to prevent use of a copied card, but at this point, is not
a requirement for the aviation industry.
Non-proprietary Universally Unique Identifier
The Universally Unique Identifier (UUID) is also commonly referred to as a Unique User Identifier, or a
Globally Unique Identifier (GUID).
A UUID is an identifier that is unique across both space and time. One of the main reasons for using UUIDs
is that no centralized authority is required to administer them. As a result, UUID generation on demand
can be completely automated, and used for a variety of purposes. For the purpose of this paper, UUIDs can
be used for personnel identity credentials. Since UUIDs are unique and persistent, they make excellent
Uniform Resource Names (URNs).
URNs are intended to serve as persistent, location-independent identifiers. The unique ability to generate
a new UUID without a registration process allows for UUIDs to serve as a credential identifier with the
lowest cost to establish and implement.
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